CN115077776A - Buoyancy testing device and method - Google Patents
Buoyancy testing device and method Download PDFInfo
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- CN115077776A CN115077776A CN202210650389.9A CN202210650389A CN115077776A CN 115077776 A CN115077776 A CN 115077776A CN 202210650389 A CN202210650389 A CN 202210650389A CN 115077776 A CN115077776 A CN 115077776A
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- 238000012360 testing method Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims description 14
- 239000002689 soil Substances 0.000 claims abstract description 28
- 230000009471 action Effects 0.000 claims abstract description 8
- 230000005484 gravity Effects 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 125000003003 spiro group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
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Abstract
The invention relates to the technical field of material performance testing, in particular to a buoyancy testing device and a testing method, wherein the buoyancy testing device comprises a supporting frame, a hanging part, a tension sensor, an inner cylinder, a box body and a data acquisition instrument, wherein the hanging part is adjustably arranged on the supporting frame, the hanging part is used for hanging articles, such as hanging hook codes or the inner cylinder and the like, the tension sensor is arranged on the hanging part, and the tension sensor is used for testing the strain generated by the tension sensor under the action of the gravity of the articles on the hanging part; the inner cylinder is detachably connected with the hanging piece, and the bottom of the inner cylinder is provided with a soil pressure cell; the box body is provided with an accommodating cavity and an opening communicated with the accommodating cavity, the accommodating cavity is used for accommodating a sample, and the inner cylinder extends into the accommodating cavity from the opening; the tension sensor and the soil pressure cell are respectively and electrically connected with the data acquisition instrument. By using the buoyancy testing device, the data measured by the soil pressure cell at the bottom of the inner cylinder is used as auxiliary calibration, so that the buoyancy value obtained by using the tension sensor for testing is more reliable, and repeated testing is avoided.
Description
Technical Field
The invention relates to the technical field of material performance testing, in particular to a buoyancy testing device and a buoyancy testing method.
Background
With the rapid development of urban traffic, the development and utilization of underground space are increasing day by day, wherein the shield method is widely applied to subway tunnel engineering construction due to the characteristics of convenient construction, low noise and high construction speed. In the grouting process, the pipe piece is tightly wrapped by the slurry and is very easy to float due to buoyancy, and the floating of the pipe piece can cause engineering safety accidents such as shearing and damage of bolts between the pipe pieces, dislocation of the pipe pieces, water leakage in the pipe pieces and the like.
At present, a control method for controlling the floating of a duct piece in grouting operation generally prepares slurry with poor flowing performance on the premise of ensuring pumping performance, so that the condition that slurry with different flowing performance or other performance is accurately tested to provide buoyancy for objects wrapped by the slurry under the same condition is very important for ensuring safe construction of grouting operation. In the traditional technical scheme, an earth pressure cell or a strain gauge is usually directly arranged in a mortar column or the inner wall of a container at a certain height, and the pressure is used for representing the capability of the slurry for providing buoyancy, so that the operation is simplified, and the test can be used for various slurries with wider fluidity range.
Disclosure of Invention
The invention aims to provide a buoyancy testing device and a buoyancy testing method, which have the advantages that the testing structure is more reliable, and repeated operation is avoided.
In order to realize the purpose, the following technical scheme is provided:
a buoyancy tester device comprising:
a support frame;
the hanging piece is adjustably arranged on the support frame and is used for hanging articles;
the tension sensor is arranged on the hanging piece and is configured to test strain generated by the tension sensor under the action of gravity of the article hung on the hanging piece;
the inner cylinder is detachably connected to the hanging piece, and a soil pressure box is arranged at the bottom of the inner cylinder;
the sample collection device comprises a box body and an inner barrel, wherein the box body is provided with an accommodating cavity and an opening communicated with the accommodating cavity, the accommodating cavity is used for accommodating a sample, and the inner barrel can extend into the accommodating cavity from the opening;
and the tension sensor and the soil pressure box are respectively and electrically connected with the data acquisition instrument.
Further, a release agent is arranged on the outer surface of the inner cylinder.
Furthermore, the hanging part comprises two screw rods, the tension sensor is connected between the two screw rods, one screw rod is in threaded connection with the support frame, the other screw rod is provided with a connecting plate, and the inner cylinder is detachably connected with the connecting plate.
Furthermore, the support frame includes two support columns and crossbeam, two the support column interval sets up, the crossbeam sets up in two on the support column, link up on the crossbeam and seted up threaded hole, one the screw rod spiro union in the threaded hole.
Furthermore, the box body is arranged on the supporting seat.
Further, a feed inlet is formed in the side wall of the bottom of the box body, and a valve is arranged at the feed inlet.
Further, a test method of the buoyancy test device is also provided, and comprises the following steps:
step 2, adding a sample into the box body, compacting by adopting a vibrating rod, and filling the sample into the box body to a set height H;
step 3, connecting the hanging piece and the inner cylinder, opening the data acquisition instrument, and setting the strain reading of the tension sensor to be zero;
step 4, the hanging piece is arranged on a support frame, the inner cylinder is suspended in the air and placed in the box body, and the strain reading epsilon 0 of the tension sensor is recorded;
step 5, adjusting the hanging piece to enable the inner cylinder to descend until the bottom of the inner cylinder is lower than the upper surface of the sample;
step 6, adjusting the hanging piece to enable the inner cylinder to move upwards until the strain reading of the tension sensor is epsilon 0, and stopping moving the inner cylinder upwards;
step 8, recording a strain indication epsilon 1 of the tension sensor, wherein the elastic modulus of the tension sensor is E, and calculating the buoyancy F provided by the sample to the inner cylinder through a formula F ═ Ex (epsilon 0-epsilon 1);
and 9, reading a pressure indication P of the soil pressure cell, wherein the pressure area of the soil pressure cell is S, and calculating the buoyancy F applied to the soil pressure cell according to the formula F-S × P, wherein if F-F | ≦ 5%, the buoyancy F value provided by the sample to the inner cylinder, which is obtained by the test in the step 8, is valid.
Further, the step 1 of calibrating the tension sensor, and the specific steps of determining the elastic modulus of the tension sensor are as follows:
step 1.1, mounting the hanging piece on the support frame;
step 1.2, hanging a hook code on the hanger, and obtaining a G-epsilon curve according to the change condition of the strain indication epsilon of the tension sensor along with the weight G of the hook code, wherein the slope of the curve is the elastic modulus of the tension sensor.
Further, between the step 3 and the step 4, a step M is further included: and a release agent is smeared on the outer surface of the inner cylinder.
Further, in the step 7, after the sample is added into the box body, the vibrating rod is adopted for compaction.
The invention has the beneficial effects that:
according to the buoyancy testing device, the containing cavity in the box body is used for containing a sample, the hanging piece is adjustably arranged on the supporting frame so as to adjust the position of the inner cylinder extending into the containing cavity, the inner cylinder is ensured to be accurately contacted with the sample in the containing cavity, and the reliability and the accuracy of a buoyancy value provided by the sample obtained by testing through the tension sensor to the inner cylinder are ensured. In addition, still set up the soil pressure cell through the bottom at the inner tube among the buoyancy testing arrangement, regard as supplementary calibration with the data that the soil pressure cell at inner tube bottom measured, will utilize the sample that the tension sensor test obtained to provide the buoyancy value to the inner tube and compare with the data that the soil pressure cell measured, ensure that the test result is more accurate reliable, can avoid retesting. The test method of the buoyancy test device is simple and convenient to operate, has more reliable results compared with the traditional method, and avoids inconvenient operation of repeated tests.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a buoyancy testing device according to an embodiment of the present invention.
In the figure:
1-a support frame; 11-a support column; 12-a cross beam; 13-diagonal bracing;
2-hanging parts; 21-screw rod; 211-a first screw; 212-a second screw; 22-a connecting plate; 23-a bolt;
3-a tension sensor;
4-inner cylinder; 41-soil pressure cell;
5-a box body; 51-a containment chamber; 52-opening; 53-feed inlet;
6-a data acquisition instrument;
7-supporting seat.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when the product is used, and are only for convenience of description of the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only or to distinguish different structures or components, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1, an embodiment of the present invention provides a buoyancy testing device, which includes a support frame 1, a hanger 2, a tension sensor 3, an inner cylinder 4, a box 5, and a data acquisition instrument 6. The hanging part 2 is adjustably arranged on the support frame 1, and the hanging part 2 is used for hanging articles, such as hanging hook codes or inner cylinders 4. The tension sensor 3 is arranged on the hanger 2, the tension sensor 3 is configured to test the strain generated by the tension sensor 3 under the action of gravity of the article hung on the hanger 2, and the tension sensor 3 in the embodiment is a strain type tension sensor and can measure the displacement generated under the action of external force, namely, the displacement is used as a strain. The inner cylinder 4 is detachably connected with the hanging piece 2, and the bottom of the inner cylinder 4 is provided with a soil pressure box 41; the box body 5 has an accommodating cavity 51 and an opening 52 communicating with the accommodating cavity 51, the accommodating cavity 51 is used for accommodating a sample, and the inner cylinder 4 can extend into the accommodating cavity 51 from the opening 52. The tension sensor 3 and the soil pressure cell 41 are respectively and electrically connected to the data acquisition instrument 6, and the data acquisition instrument 6 in this embodiment is respectively and electrically connected to the tension sensor 3 and the soil pressure cell 41 through electric wires.
The chamber 51 that holds of box 5 in the buoyancy testing arrangement of this embodiment is used for the holding sample, sets up on support frame 1 through with hanger 2 is adjustable to adjust the position that inner tube 4 stretched into and hold in the chamber 51, ensure that inner tube 4 and the accurate contact of the sample that holds in the chamber 51, ensure to utilize the sample that tension sensor 3 tested and obtained to provide the reliability and the accuracy of buoyancy value to inner tube 4. In addition, in the buoyancy testing device, the soil pressure cell 41 is arranged at the bottom of the inner cylinder 4, data measured by the soil pressure cell 41 at the bottom of the inner cylinder 4 is used as auxiliary calibration, and a sample obtained by testing the tension sensor 3 is used for providing a buoyancy value for the inner cylinder 4 and comparing the buoyancy value with the data measured by the soil pressure cell 41, so that repeated testing can be avoided.
Optionally, a release agent is arranged on the outer surface of the inner cylinder 4, after a sample is added into the box body 5, the vibrating rod is used for contacting the inner cylinder 4, the static friction and the viscous force between the sample and the outer surface of the inner cylinder 4 can be completely released under the matching of the release agent and the vibrating rod, and the accuracy of a test result is improved.
Optionally, the hanger 2 includes two screws 21, the two screws 21 are respectively a first screw 211 and a second screw 212, and the tension sensor 3 is connected between the first screw 211 and the second screw 212. Wherein, the first screw 211 is screwed on the support frame 1, the second screw 212 is provided with a connecting plate 22, and the inner cylinder 4 is detachably connected to the connecting plate 22. By arranging the tension sensor 3 between the first screw 211 and the second screw 212, when an article is hung on the second screw 212, the tension sensor 3 is deformed under the action of gravity of the article, and the tension sensor 3 tests the strain. The connecting plate 22 is arranged at one end of the second screw 212 far away from the first screw 211, and the inner cylinder 4 is ensured to be stably arranged on the hanger 2 by arranging the connecting plate 22 on the second screw 212.
Optionally, the support frame 1 includes two support columns 11 and a cross beam 12, the two support columns 11 are arranged at intervals, the cross beam 12 is arranged on the two support columns 11, an inclined strut 13 is arranged between each support column 11 and the cross beam 12, namely, the inclined strut 13 and the cross beam 12 are arranged at an included angle, one end is connected to the cross beam 12, the other end is connected to the support column 11, the support frame 1 with a firm structure is formed by the support columns 11, the cross beam 12 and the inclined strut 13, and stable support is provided for the hanger 2 and the inner cylinder 4. Threaded holes are formed in the cross beam 12 in a penetrating mode, the first screw 211 is in threaded connection with the threaded holes, and one end, far away from the second screw 212, of the first screw 211 penetrates through the threaded holes and then is fixed through nuts. Through with first screw rod 211 spiro union in the screw hole on crossbeam 12, the pendant 2 demountable installation of being convenient for can also adjust the position of pendant 2 on support frame 1, the operation of being convenient for simultaneously through rotating the nut on first screw rod 211 on the support frame 1.
Optionally, the buoyancy testing device of this embodiment further includes a supporting seat 7 located below the cross beam 12, the supporting seat 7 is located between the two supporting columns 11, the box body 5 is disposed on the supporting seat 7, the opening 52 of the box body 5 faces the cross beam 12, and the box body 5 is supported and fixed by the supporting seat 7.
Optionally, a feed port 53 is arranged on the side wall of the bottom of the box body 5, and the feed port 53 is provided with a valve. The sample is fed into the accommodating chamber 51 of the case 5 through the feed port 53, and the opening and closing of the feed port 53 is controlled by opening or closing a valve. The feeding hole 53 is arranged on the side wall of the bottom of the box body 5, so that the inner barrel 4 is prevented from being disturbed in the process of adding the sample.
Optionally, the inner cylinder 4 is columnar, and the outer side wall of the inner cylinder 4 is provided with scale marks.
The embodiment also provides a testing method of the buoyancy testing device, in the embodiment, the sample injected into the box body 5 may be mortar or a sample which can react, and is suitable for testing the buoyancy generated by the mortar or the sample which can react on the inner cylinder 4, and the method specifically includes the following steps:
And 2, adding the sample into the box body 5, compacting by adopting a vibrating spear, filling the sample into the box body 5 to a set height H, and adding the sample into the box body 5 until the upper surface of the sample is five centimeters away from the bottom of the box body 5 in the embodiment. The contact inner cylinder 4 vibrates through the vibrating spear to release the static friction and viscous force between the sample and the outer surface of the inner cylinder 4.
Step 3, vertically place inner tube 4 on subaerial, connect hanger 2 and inner tube 4, be about to connect inner tube 4 in connecting plate 22, connect tension sensor 3 between first screw 211 and the second screw 212, then open data acquisition instrument 6, the indication number of meeting an emergency of tension sensor 3 sets up to zero through data acquisition instrument 6, inner tube 4 at this moment is supported by ground, tension sensor 3 only receives self action of gravity, then can deduct the error that tension sensor 3 dead weight introduced through this step, improve the test accuracy.
Step 4, fixedly connecting the inner cylinder 4 to a connecting plate 22 through a bolt 23; then the first screw 211 is matched with a nut to install the hanger 2 on the cross beam 12 of the support frame 1, namely the first screw 211 penetrates through a threaded hole on the cross beam 12 and then is fixed by the nut; finally, the inner cylinder 4 is placed in the box body 5 in a suspended mode, the strain reading epsilon 0 of the tension sensor 3 is recorded through the data acquisition instrument 6, the tension sensor 3 is stretched under the action of gravity of the inner cylinder 4 to generate deformation, the strain reading epsilon 0 is tensile strain caused by the self weight of the inner cylinder 4, namely the self weight G0 of the inner cylinder 4 is equal to epsilon 0. E, and the strain reading epsilon 0 of the tension sensor 3 is larger than 0.
And 5, adjusting the hanger 2 to enable the inner barrel 4 to descend, and descending the inner barrel 4 until the bottom of the inner barrel 4 is lower than the upper surface of the sample, wherein optionally, the bottom of the inner barrel 4 is 1-8 mm lower than the upper surface of the sample. In the step 5, the operation method for making the bottom of the inner cylinder 4 lower than the upper surface of the sample is different according to different specific operations of the sample with different plasticity, the inner cylinder 4 can be directly placed downwards for the sample with better plasticity, and the dry and hard sample is pressed downwards into the inner cylinder 4.
And 6, adjusting the hanging piece 2 to enable the inner cylinder 4 to move upwards until the strain reading of the tension sensor 3 is epsilon 0, and stopping moving the inner cylinder 4 upwards. During actual operation, the error of ε 0 remains within. + -. 1%.
Through the steps 4 to 6, the interference of the supporting force which can be provided by the sample at the bottom of the box body 5, namely the situation that the sample at the bottom of the box body 5 is compact and is pressed with the inner cylinder 4 so as to provide the supporting force of the inner cylinder 4 can be eliminated.
Optionally, in the steps 5 and 6, the hanger 2 is adjusted to enable the inner cylinder 4 to descend or move upwards, and the nut can be rotated forward in the axial direction of the first screw 211 to enable the first screw 211 to descend so as to drive the inner cylinder 4 to descend; the nut is rotated in the reverse direction to move the first screw 211 upward, thereby moving the inner cylinder 4 upward.
And 7, scale marks are arranged on the outer side wall of the inner barrel 4, a sample is added into the box body 5 to the position of the L scale mark on the outer side wall of the inner barrel 4, during actual test, the sample can be added into the box body 5 to the position of the 20 cm scale mark on the outer side wall of the inner barrel 4, and at the moment, the sample in the box body 5 contacts the inner barrel 4 and provides buoyancy for the inner barrel 4.
And 8, scraping the upper surface of the sample, after the readings of the tension sensor 3 are stable, recording the strain readings epsilon 1 of the tension sensor 3 by the data acquisition instrument 6, wherein the elastic modulus of the tension sensor 3 is E, and calculating the buoyancy F provided by the sample to the inner cylinder 4 by the formula F ═ Ex (epsilon 0-epsilon 1).
And 9, reading a pressure indication P of the soil pressure cell 41, wherein the pressure area of the soil pressure cell 41 is S, and calculating the buoyancy F applied to the soil pressure cell 41 according to the formula F ═ S × P, wherein if | -, F | -, 5%, the buoyancy F value provided by the sample to the inner cylinder 4, which is obtained by the test in the step 8, is valid. And if | - > 5%, the buoyancy F obtained by the test is invalid, and the test is carried out again.
Optionally, in the testing method using the buoyancy testing device in this embodiment, if it is required to test the buoyancy provided by the higher sample in the box 5 to the inner cylinder 4, after pouring a sample with a height of 20 cm into the box 5 each time, step 8 and step 9 are repeated, and the stress readings of the tension sensor 3 and the pressure readings of the soil pressure cell 41 are recorded at regular time.
The testing method of the buoyancy testing device of the embodiment utilizes the tension sensor 3 to test the buoyancy value provided by the sample in the box body 5 to the inner cylinder 4, and compared with the result of the test of the soil pressure cell 41, the result is more reliable compared with the traditional method, and the inconvenience in repeated test operation is avoided.
Optionally, step 1, calibrating the tension sensor 3, and the specific steps of determining the elastic modulus of the tension sensor 3 are as follows:
step 1.1, the hanging part 2 is installed on the support frame 1, namely, the hanging part 2 is installed on the support frame 1 through the first screw 211 penetrating through a threaded hole in the cross beam 12 and then fixed by a nut, and the tension sensor 3 is connected between the first screw 211 and the second screw 212.
Step 1.2, hanging hook codes on a connecting plate 22 of the hanger 2, and obtaining a G-epsilon curve according to the change condition of the strain indication epsilon of the tension sensor 3 along with the weight G of the hook codes, wherein the slope of the curve is the elastic modulus of the tension sensor 3. After the test is finished, the hanger 2 is detached from the support frame 1.
In the step 1, in the G-epsilon curve, the sampling quantity of G and the corresponding epsilon is respectively more than or equal to 5, linear fitting is adopted, and when the Correlation Coefficient of Pearson (Pearson Correlation Pearson) is more than 0.999, the test result is considered to be valid; the relative deviation between the measured elastic modulus of the tension sensor 3 and the nominal elastic modulus of the tension sensor 3 is not more than 5%, the calibration result is considered to be effective, and the elastic modulus of the tension sensor 3 obtained through actual testing is adopted in subsequent calculation. If the relative deviation between the measured elastic modulus of the tension sensor 3 and the nominal elastic modulus of the tension sensor 3 exceeds 5%, retesting according to step 1. The Pearson correlation coefficient is used for measuring whether two data sets are on the same line or not, and is used for measuring the linear relation between distance variables, wherein the closer the correlation coefficient is to 1 or-1, the stronger the correlation is, the closer the correlation coefficient is to 0, and the weaker the correlation is.
Optionally, between step 3 and step 4, further comprising step M: and a release agent is coated on the outer surface of the inner cylinder 4 so as to be matched with the vibrating rod subsequently, and the static friction and the viscous force between the sample and the outer surface of the inner cylinder 4 are released.
Optionally, in step 7, after the sample is added into the box 5, the vibrating rod is adopted for compaction, and under the cooperation of the release agent and the vibrating rod, the static friction and the viscous force between the sample and the outer surface of the inner cylinder 4 can be completely released, so that the accuracy of the test result is improved. In addition, the cooperation of the release agent and the vibrating rod can be suitable for testing a sample which reacts, and the stress generated at the bottom of the inner cylinder 4 due to the volume change of the sample which reacts is prevented, so that the method is also suitable for the sample which reacts, and the process of testing the buoyancy change until the buoyancy change disappears can be continuously carried out.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A buoyancy tester, comprising:
a support frame (1);
the hanging piece (2) is adjustably arranged on the support frame (1), and the hanging piece (2) is used for hanging articles;
the tension sensor (3) is arranged on the hanger (2), and the tension sensor (3) is configured to test the strain of the tension sensor (3) under the action of the gravity of the article hung on the hanger (2);
the inner cylinder (4) is detachably connected to the hanging piece (2), and a soil pressure box (41) is arranged at the bottom of the inner cylinder (4);
the sample collection device comprises a box body (5), wherein the box body (5) is provided with a containing cavity (51) and an opening (52) communicated with the containing cavity (51), the containing cavity (51) is used for containing a sample, and the inner cylinder (4) can extend into the containing cavity (51) from the opening (52);
the tension sensor (3) and the soil pressure box (41) are respectively and electrically connected with the data acquisition instrument (6).
2. The buoyancy testing device according to claim 1, wherein a release agent is provided on the outer surface of the inner barrel (4).
3. The buoyancy testing device according to claim 1, wherein the hanger (2) comprises two screw rods (21), the tension sensor (3) is connected between the two screw rods (21), one screw rod (21) is screwed on the support frame (1), a connecting plate (22) is arranged on the other screw rod (21), and the inner cylinder (4) is detachably connected to the connecting plate (22).
4. The buoyancy testing device according to claim 3, characterized in that the support frame (1) comprises two support columns (11) and a cross beam (12), the two support columns (11) are arranged at intervals, the cross beam (12) is arranged on the two support columns (11), a threaded hole is formed in the cross beam (12) in a penetrating manner, and one screw (21) is screwed in the threaded hole.
5. The buoyancy testing device according to claim 4, further comprising a support base (7) located below the cross beam (12), wherein the tank body (5) is disposed on the support base (7).
6. The buoyancy testing device according to claim 1, characterized in that a feed inlet (53) is arranged on the side wall of the bottom of the box body (5), and the feed inlet (53) is provided with a valve.
7. A method of testing a buoyancy testing device according to any one of claims 2 to 6, comprising the steps of:
step 1, calibrating a tension sensor (3), and determining the elastic modulus of the tension sensor (3);
step 2, adding a sample into the box body (5), compacting by adopting a vibrating rod, and filling the sample into the box body (5) to a set height H;
step 3, connecting the hanger (2) and the inner cylinder (4), opening the data acquisition instrument (6), and setting the strain reading of the tension sensor (3) to be zero;
step 4, the hanging piece (2) is arranged on the support frame (1), the inner cylinder (4) is suspended in the air and placed in the box body (5), and the strain reading epsilon 0 of the tension sensor (3) is recorded;
step 5, adjusting the hanger (2) to enable the inner cylinder (4) to descend, wherein the inner cylinder (4) descends until the bottom of the inner cylinder (4) is lower than the upper surface of the sample;
step 6, adjusting the hanging piece (2) to enable the inner cylinder (4) to move upwards until the strain indication number of the tension sensor (3) is epsilon 0, and stopping moving the inner cylinder (4) upwards;
step 7, adding the sample into the box body (5) to the position of an L-shaped scale mark on the outer wall of the inner cylinder (4);
step 8, recording a strain index epsilon 1 of the tension sensor (3), wherein the elastic modulus of the tension sensor (3) is E, and calculating to obtain buoyancy F provided by the sample to the inner cylinder (4) through a formula F ═ Ex (epsilon 0-epsilon 1);
and 9, reading a pressure index P of the soil pressure box (41), wherein the pressure area of the soil pressure box (41) is S, and calculating the buoyancy F borne by the soil pressure box (41) through a formula F-S × P, wherein if | -, F-F | -, 5%, the buoyancy F value provided by the sample to the inner cylinder (4) by the test sample obtained in the step 8 is valid.
8. The test method of the buoyancy test device according to claim 7, wherein the step 1 of calibrating the tension sensor (3) comprises the following specific steps of determining the elastic modulus of the tension sensor (3):
step 1.1, installing the hanger (2) on the support frame (1);
step 1.2, hanging a hook code on the hanging piece (2), and obtaining a G-epsilon curve according to the change condition of the strain indicating number epsilon of the tension sensor (3) along with the weight G of the hook code, wherein the slope of the curve is the elastic modulus of the tension sensor (3).
9. The method for testing the buoyancy testing device according to claim 7, further comprising, between the step 3 and the step 4, a step M of: and a release agent is smeared on the outer surface of the inner cylinder (4).
10. The method for testing a buoyancy testing device according to claim 7, wherein in the step 7, the vibrating rod is used for compacting after the sample is added into the box body (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210650389.9A CN115077776A (en) | 2022-06-09 | 2022-06-09 | Buoyancy testing device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210650389.9A CN115077776A (en) | 2022-06-09 | 2022-06-09 | Buoyancy testing device and method |
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| CN115077776A true CN115077776A (en) | 2022-09-20 |
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| CN202210650389.9A Pending CN115077776A (en) | 2022-06-09 | 2022-06-09 | Buoyancy testing device and method |
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